What is the integral from-2 to 0 of (x+2)/(x^2+2x+2) ?

The integral from-2 to 0 of (x+2)/(x^2+2x+2) is pi/2

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integral from-2 to 0 of (x+2)/(x^2+2x+2)

\int_{- 2}^{0} \frac{x + 2}{x ^{2} + 2 x + 2} d x

\frac{π}{2}

Decimal

1.57079 \dots

Solution steps

\int_{- 2}^{0} \frac{x + 2}{x ^{2} + 2 x + 2} d x

Complete the square

x^{2} + 2 x + 2 : (x + 1)^{2} + 1

= \int_{- 2}^{0} \frac{x + 2}{( x + 1 ) ^{2} + 1} d x

Apply u-substitution

: \int_{- 1}^{1} \frac{u + 1}{u ^{2} + 1} d u

= \int_{- 1}^{1} \frac{u + 1}{u ^{2} + 1} d u

Expand

\frac{u + 1}{u ^{2} + 1} : \frac{u}{u ^{2} + 1} + \frac{1}{u ^{2} + 1}

Apply the Sum Rule:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= \int_{- 1}^{1} \frac{u}{u ^{2} + 1} d u + \int_{- 1}^{1} \frac{1}{u ^{2} + 1} d u

\int_{- 1}^{1} \frac{u}{u ^{2} + 1} d u = 0

\int_{- 1}^{1} \frac{1}{u ^{2} + 1} d u = \frac{π}{2}

= 0 + \frac{π}{2}

Simplify

= \frac{π}{2}

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What is the integral from-2 to 0 of (x+2)/(x^2+2x+2) ?
The integral from-2 to 0 of (x+2)/(x^2+2x+2) is pi/2